Even B&H was susceptible to knock-off batteries. Somewhere in the supply chain, fake batteries were introduced, but not found until sold to customers. B&H actually handled this in the only sane way vs the Amazon shrug of the shoulders.
Supply chain attacks are real and even reputable vendors are susceptible. The difference is how the vendors react with their customers that separates the good vendor from the bad vendor.
The difference is Amazon only pretends to care, and only cares about enough plausible deniability to deflect lawsuits (the courts are catching on and this no longer works). Their practice of stickerless commingled inventory ensures that even buying from Amazon itself is no guarantee of not getting a counterfeit product.
Supply chain attacks are real and even reputable vendors are susceptible. The difference is how the vendors react with their customers that separates the good vendor from the bad vendor.